Automatically upgraded without my permission and paying for a device i dont have or know anything about

My name is Jefrey Mohale i have two contracts with cellc last year on the 13th of December 2022 i went to Midrand Boulevard Cellc shop to check if i dont qualify for upgrade. I was told that i dont qualify and i requested that they can then stop my contract when it expires. Boom last week the 17th my wife got a massage that i am upgraded. I tried to call cellc to no avail. Only yestetday i managed to get thru when i asked why am i still paying R1100 for the same benefit they said 400 plus was for the device which i didnt get from anyone. I adked to speak to the supervisor boom he or she was busy in a meeting and they will get back to me in 30 minutes no call received after 30 minutes. I called again after 5 hours boom they are still busy. I told the woman who helped me to send a massage that i will reverse the premiums until i get an answer to the why am i paying for a device i dont have and why was i automatically upgraded when i was told to my face that the system rejected me.